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rough idle

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02gtpalder

New member
i have a 2002 gtp no mods I am new to the web site an have found a ton of great info but now i am in a bind. I recently have changed my intake gaskets because of a light leak. Two week later my car is idling rough so i changed plugs wire and coils didn't change a thing so i took carb cleaner to check for vac leaks and nothing. I was wondering if anyone else had any ideas?
 


Get it scanned and check Long Term Fuel Scans... try to find a local GTP member and ask them nicely to scan your car.

Also, any Service Engine Codes? If so, list them..

Odds are you have a vacuum leak.
 
EGR maybe. It should be shut at idle, it could have failed open on you. I’m with Goose 100%, you need it scanned. Because it could be several items, especially since you didn’t give a whole lot of information. Anyway, checking out and cleaning the EGR is easy and free.:th_thumbsup-wink:
 
The car runs smooth as can be at 1300rpm anything below that it gets ruff i just got it back yesterday from having brand new trans installed and he also told me he ran codes on the car an said i had a misfire and possible clogeed cat so thats when i did the plugs wire and coils. Could it maybe the cat?
 


02gtpalder said:
The car runs smooth as can be at 1300rpm anything below that it gets ruff i just got it back yesterday from having brand new trans installed and he also told me he ran codes on the car an said i had a misfire and possible clogeed cat so thats when i did the plugs wire and coils. Could it maybe the cat?
Click to expand...

It certainly could be your cat. If your car has over about 120k, that would be in my top 5 list.

To check it, drive around tonight get the engine heated up. Get on it a little, and then pull over in a dark area. Leave the car running, pop the hood and look at your exhaust piping before the cat (and the cat itself). If it is glowing, the cat is your problem.
 


im a certified tig and mig welder so i think im going to just do a delete since we dont have emissions. and then go from there then thanks a bunch for your in put!
 
I just thought of another cheap easy one, replace your PCV valve. It is a way out there chance like 1:1000, but its two bucks

Although I’m pretty sure your cat is the issue. I have seen dozens of people that refuse to believe that cats and O2 sensors don’t last forever.:th_shakinghead2:

PS deleteing it will give you a perma CEL :(
 
Honestly, I’m not sure they work for 04+.
The only method I do know works is the PCM code delete.
I’d give it a 50/50 chance
 
ok figured it out guys after putting it on my fathers scanner and drove it #6 was the only one not firing so did compression test it was good so i got to looking and the wires to the plug for injector were bare an breaking so i repaired that and runs great again thanks for everyones help!
 


I’m glad you found it :th_thumbsup-wink: :th_beer-toast1:, just as we suggested in the very beginning you needed to do a scan. I’ll never understand why people are so reluctant to use such a good diagnostic tool.
 
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